1 /*
2  * Copyright (C) 2014 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.bluetooth.util;
18 
19 /**
20  * Utility for parsing numbers in Bluetooth.
21  */
22 public class NumberUtils {
23 
24     /**
25      * Convert a byte to unsigned int.
26      */
unsignedByteToInt(byte b)27     public static int unsignedByteToInt(byte b) {
28         return b & 0xFF;
29     }
30 
31     /**
32      * Convert a little endian byte array to integer.
33      */
littleEndianByteArrayToInt(byte[] bytes)34     public static int littleEndianByteArrayToInt(byte[] bytes) {
35         int length = bytes.length;
36         if (length == 0) {
37             return 0;
38         }
39         int result = 0;
40         for (int i = length - 1; i >= 0; i--) {
41             int value = unsignedByteToInt(bytes[i]);
42             result += (value << (i * 8));
43         }
44         return result;
45     }
46 }
47